Re: More results from DRSSTC land

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Conner <steve@xxxxxxxxxxxx>

>There might be something wrong there with the rail power supplies like a 
bad +V cap...

I think there is just plain not enough bypass capacitance to handle the HF 
current. The bypass caps form a parallel resonant circuit with the 
electrolytic cap ESL and the resonant frequency of this ought to be well 
below the ripple fundamental at twice the operating frequency. Mine 
probably resonates above 2Fo but below the ripple second harmonic at 4Fo. 
You do not want it to resonate AT 2Fo or you would get no power output 
whatsoever and spikes up to twice the DC link voltage!

I only have two 1uF caps there, I should really add 10-20uF worth. Anyway, 
the bang energy measurement should take this drooping fully into account.


>I wonder what has happened if anyone has tried running a big pig type system
>into a "tiny" coil???

Well that is more or less what we _are_ doing since it's so easy to achieve 
high bang energies with DRSSTCs. You find that in order not to burn up the 
secondary with racing sparks and flashovers, you have to slow the energy 
transfer down compared to a bigger coil. So you get shorter but brighter 
streamers. On a classic coil you would slow the transfer by loosening the 
coupling.


Steve